Colored glass.



1 STATES PATENT l .ga ggomso specimens; f Leners raten PatentedApraZl'i, 1911..

.K pplioniled October 29, 1910. Serial Io. 589,77.

Toalwhomitmyccmcanz Be it known that I, HENRY MART.` Snam-Nien, acitizen of the'nited States of Americmfresiding at 246 Penn street',inthe borough of Brooklyn, city and State of New A York, have inventedcertain new and useul Improvements in Colored Glass, of which thefollowing is a description. y

The disadvantages of the` various makes and kinds of colored glassnowgused -or lenses and other scientific urposes are: If the "so-calledpot colored glass is ground to convex or concave form, its uniform'ercentage of color is destroyed. The so-ca led- 15. iiashed glasspermits grinding on the un- Q flashed side only without destroying theunform percentage of color.-

My invention relates to an improvement in making colored gla to be usedfor manu- Y 20 facturing .lenses for spectacles, ey'e glasses,

pince nez, lorgnettes, opera glasses, field glasses, bird glasses,telescopes, cameras and other optical, electrical and scientificinstruments, such as are used in submarines, ocean i 2S vessels,balloons, aeroplanes and for other purposes, so thatv in lenses madefrom glass of in invention, the percentage of *colori is not estroyed orreducedjby the ordinary means employed in the art of manufacturing 39lenses of any 'curve or focus, or an combination of curves or foci. Iproceed y placing one or more sheets or layers of pot' colored glassbetween two or `more sheets of white,

transparent glass and combine these into one honiogeneous mass by.fusing by heat; al-

though the various layers may be combined by other means, such ascementing with adhesive substance as Canada balsam, Prince' Ru crtdrops, or the like.

o better illustrate my invention, referince is`h`ad to the accompanyingdrawings x vhich form a part of this specification. f\ Figure 1represents a piece of colored glass roduced according to my invention:a, represents sheets of white, transparent glass of 'any desiredthickness or thicknesscs,'index or' indices of refraction; b, representssheet orsheets'o potcolored glass of a color or colors to produce theshade, tint or combination of colors desired, the whole combined intoone mass. Fig. 2 represents thisglass ground to plano convex form; Fig.3 ground to plano concave form; Fig. 4 ground to biconvex form; F 1g. 5ground to biconcave form.; Fig. 6 ffrou'nd in the shape 55 of a rightangle prism although prisms of 'any other :Form may as readily be made);Fig. 7 represents a piece of glass similar t/o Fig. 1; except that forconvenience and to save labor it has been bent bv heat into what isknoxm in the trade as a drop blank Fig. S represents a dropped b ank ofmy colored glass in periscopic or toric com-ex form; Fig. 9 representsit in perisoopic or toric concave form. Fig. 10 represents the top viewof an original blank. This is to illustrate that my colored glass may be*ground into lens of any curve or foci, without in ahy'-way destroyingor reducing the percentage of uniformity of color. Fiv. 11 represents apiece of pot colored glass; ig. 12 represents the same ground to .convexvform; Fig; '13 ground to concave form; i I

showing how the uniformity of pcrcent- 7.5 such glass; Fig. 14represents a piece of socalled flashed glass in its original state; Fig.15 represents the same glass ground to cone' vex form Fig. 16 ground. toconcave form. This isto illustrate the limitations of the use offlashedglass. Fig. .17're resents a t view of a convex lens made rom pot coored glass,showing a greater percentage of color in the center; Fig. 18represents a to view of a concave lens made from pot .co ored glassshowing a greater percentage of color on the edge.. A i Y I do not claimto be the first to make colored glass for optical or other urpos, but Ido claim to be the firstV to pr uce a colored glass in a homogeneousmass wherein the color or colors are so laced that the same areabsolutely -.xed an uniform in the glass in its crude state, making itpossible to grind any onefcurve'or section of same,'such as spherical,cylindrical, pcrisoopc. :avenir-nus,- torio, hyperbolic, conchoidial orellipsilodinl, or-any combination of same without destroying or reducingthe percentage of color, so that lenses made from colored glas of myinvention may be depended upon as abso- Vlutely 'reliable and uniform,and that they will always have the same relative amount of color whenfinished as the glass had in its rough state.

What I claim as new and desire to secure by Letters Patent is:

1. Av colored optical glass consisting of -oil-inferi f L am 'or myn T-v p comm omas.

thicknesses or indices of refrebfon; substxm-- 10 tally as here'mbeforIn testimony whereo name '1n the presenof two HENRY M. SBBEINEB.

olor-ed glass oonof white, transdierent thicksubstantially one or morelayers of pot c tained between two layers ass of the same or ds ofrefraction,

ged mi l nesseS or in ribing wit. as herenbefore 2. A colored opti oneor more layexs o tained between two or transparent glass of glassconsisting of f pot colored g1 more layers of the same or different' v4VVtnesssnsl':

CHARLES Gomm, EDWARD S. Bunn.

